My guess is you all didn't read the intro. It doesn't seek to rank or grade draft classes- it seeks to say "we had this player ranked here and he got picked here, so we're ranking (and I use ranking loosely) based on the 'value' we had on our big board."
Given that Stephens was a practical unknown to most of the media, the Ravens got dinged, presumably very hard.
looks like they had him basically unranked - so yeah we got dinged hard on that one
it also says that they talk about how well a draft filled "needs" too so there's probably some subjective tinkering going on too
but yeah the intro makes it clear that it's a pretty meaningless exercise unless you think the CBS big board is somehow reputable - it even acknowledges that inherent meaninglessness - then does it anyway lol
also welcome back... long time no see